001/* 002 * ==================================================================== 003 * Licensed to the Apache Software Foundation (ASF) under one 004 * or more contributor license agreements. See the NOTICE file 005 * distributed with this work for additional information 006 * regarding copyright ownership. The ASF licenses this file 007 * to you under the Apache License, Version 2.0 (the 008 * "License"); you may not use this file except in compliance 009 * with the License. You may obtain a copy of the License at 010 * 011 * http://www.apache.org/licenses/LICENSE-2.0 012 * 013 * Unless required by applicable law or agreed to in writing, 014 * software distributed under the License is distributed on an 015 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 016 * KIND, either express or implied. See the License for the 017 * specific language governing permissions and limitations 018 * under the License. 019 * ==================================================================== 020 * 021 * This software consists of voluntary contributions made by many 022 * individuals on behalf of the Apache Software Foundation. For more 023 * information on the Apache Software Foundation, please see 024 * <http://www.apache.org/>. 025 * 026 */ 027 028package org.apache.http.impl.entity; 029 030import org.apache.http.HttpException; 031import org.apache.http.HttpMessage; 032import org.apache.http.ProtocolException; 033import org.apache.http.annotation.ThreadingBehavior; 034import org.apache.http.annotation.Contract; 035import org.apache.http.entity.ContentLengthStrategy; 036 037/** 038 * Decorator for {@link ContentLengthStrategy} implementations that disallows the use of 039 * identity transfer encoding. 040 * 041 * @since 4.2 042 */ 043@Contract(threading = ThreadingBehavior.IMMUTABLE_CONDITIONAL) 044public class DisallowIdentityContentLengthStrategy implements ContentLengthStrategy { 045 046 public static final DisallowIdentityContentLengthStrategy INSTANCE = 047 new DisallowIdentityContentLengthStrategy(new LaxContentLengthStrategy(0)); 048 049 private final ContentLengthStrategy contentLengthStrategy; 050 051 public DisallowIdentityContentLengthStrategy(final ContentLengthStrategy contentLengthStrategy) { 052 super(); 053 this.contentLengthStrategy = contentLengthStrategy; 054 } 055 056 @Override 057 public long determineLength(final HttpMessage message) throws HttpException { 058 final long result = this.contentLengthStrategy.determineLength(message); 059 if (result == ContentLengthStrategy.IDENTITY) { 060 throw new ProtocolException("Identity transfer encoding cannot be used"); 061 } 062 return result; 063 } 064 065}